Property and Equipment - Schedule of Depreciation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Property and Equipment
Depreciation	$ 1,554	$ 1,436	$ 4,473	$ 4,268
Product costs
Property and Equipment
Depreciation	235	16	629	31
Service Costs
Property and Equipment
Depreciation	787	725	2,179	2,174
Sales and Marketing
Property and Equipment
Depreciation	6	9	22	27
Product Development
Property and Equipment
Depreciation	14	22	52	68
General and Administrative
Property and Equipment
Depreciation	$ 512	$ 664	$ 1,591	$ 1,968